You should now use stored variables instead of adding a Local Storage component. This will work the same way in the background but will save you a lot of blocks. To work with tabular data in your app please use the local DB component in your app.
This storage option is useful for saving simple info on the device, especially helpful for remembering user's setting from a previous session.
To save data locally to your phone, simple name a key to store a value under. If you have a previous value in your key, saving it will override that value